Sight for guns



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C. D. MACIGLL SIGHT Fon Guus nJune 5, 1945.

Filed Jan. 3l, 1942 DHLRY MPLE MACS] L L Patented June 5, 1945 Charles Dalrymple MacgilI, Glasgow W. 3, Scotland, assignor to Barr d; Stroud, Limited,

Glasgow, Scotland Application January 31, 1942, Serial No. 429,080

3 Claims. (C1. 24U-2) This invention refers to gun sights of the re- :Hector type, i. e., comprising a transparent screen arranged obliquely to the observers line of sight to the object under observation, and through which the observer views that object, and a lamp which projects light froma graticule in a direction substantially at right angles to the line of sight on to the screen so that an image of the gratcule is formed in the observez-s line of sight as a result of reflection at the oblique screen, to which image the observer refers the object for ighting purposes.

In sights with which this invention is concerned, the lamp and other elements are er1- separable and removable from ined part, with detent means for locking the two parts together and disengageable by ringer action to release the two parts; the removable part or' the lamp casing carrying the lamp in such a way as to locate the lamp in proper position for use in the casing when the two parts of the casing are attached. Thus, on removal of the removable part of the lamp casing, the lamp is withdrawn from the sight and can be readily replaced.

A sight according to the invention may be provided with manually operated means for varying the brightness of illumination given by the lamp, and in that case preferably the said means are also carried by the removable part of the lamp casing along with the lamp. Such means may take the form of a finger-operated rheostat. Further, the electric connections for the supply of current to the lamp may be attached to the removable part of the lamp casing so that the whole of the electric system is removable from the sight with the removable part of the casing.

The invention will now be described with ref erence to the accompanying drawing, in which:

Figure l is a side elevation showing a sight of the reflector type, as a whole,

Figure 2 is an elevation at right angles relative to Figure l,

Figure 3 is a side elevation of the lamp casing portion of the sight from the opposite side relative to Figure 1, and

Figure 4 is a sectional plan view through the lower part of the sight.

The sight comprises a lamp casing A, a lamp B Within the casing A, a tubular body C extending upwards from the casing A, a hood or cover D of thin metal mounted on the tubular body C, and a transparent glass plate E mounted obliquely in the hood D. In use, the observer's eye is to the right in Figure 1 and he views the object under observation directly through the glass plate E. Light from the lamp B is projected upwards by wey or" a graticule (not shown) through the tubular body C and is reflected at the glass plate E, as a result of which an image of the graticule appears in the observers line of sight F-F to the object. To this image the observer refers the object for sighting purposes.

As shown in Figures 3 and 4 the lamp casing A is of box-shape and comprises tivo parts A1 and A2, the part A1 being a. fixture in the sight and the part A? being removable from the sight and tting on to the part A1. At the base of the removable part A2 there is a projecting retaining plate l of substantially triangular form with a key-hole slot 2 at its vertex. In the base of the fixed part A1 there is a spring-pressed stud or plunger 3 With an annular recess 4 in it. When the part A2 is in place in the part A1, the head of the stud 3 is in engagementwith the inner part of the key-hole slot 2, preventing withdrawal oi the part A2. If, however, the stud 3 is pressed upwards against spring action till the recess 4 registers with the retaining plate lI the part A2 can be Withdrawn from the part A1.

The part Avcarries the lamp B, the electric lead 5 for the supply of current to the lamp, and a rheostat 8 with an operating head l for varying the brilliance of the lamp, so that on release of the detent device I, 2, 3, these electrical elements can' be withdrawn as a whole with the removable part A3 of the lamp casing A, giving ready access to these elements.

I claim:

1. A gun sight of the reflector type as define including an electric lamp, a socket therefor and a box- 'ke lamp casing, the lamp casing comprising a major wall part which is xed in the sight and a complementary wall part made separate from said major part and of approximately the same wall thickness, and spring detent means for locking the complementry part to the major part to complete the lamp casing, with a finger-piece for releasing said detent means by a single movement of said Enger-piece, the complementary part having a bracket which extends within the mabracket.

2. A gun sight of the reflector type as defined including an electric lamp, a socket therefor and. a. box-like lamp casing, the lamp casing comprising a major wall part which is iixed in the sight and a complementary wall part made separate from said major part and of approximately the same wall thickness. and spring detent means for locking the complementary part to the major part to complete the lamp casing, with a finger-piece for releasing said detent means by a single movement of said finger-piece, the complementary part having a bracket which extends within the major part and which carries the socket and lamp transversely to the direction of projection of light from the lam-p casing and at right angles to said bracket, there being also a 20 rhegstat for regulating' the brightness of the lamp rried by and on'the interior face of the complementary part between said face and the lamp.

3. A gun sight of the reflector type as defined including an electric lamp, a socket therefor and a rectangular box-like lamp casing, the lamp casing comprising a major wall part which is fixed in the sight and a complementary Wall part made separate from said major part and of ap-` proximately the same Wall thicknessy and spring detent means for locking the complementary part to the major part to completethe lamp casing, with a. finger-piece for releasing said detent means by a single movement of said finger-piece, the complementary part having a bracket which extends within the major part and which carries the socket and lamp transversely to the direction of projection-0f light from the lamp casing and Y at right angles to said bracket.

CHAS. D. MACGIIL. 

